Automatic turret lathe



March 18, 1941. E LEISTNER 2,z35,073\

AUTOMATIC I'URRBI' LATHE Filed Dec. 14, 1938 S'Sheets-Sheet 1 3': 3; has!" 177 ?)7?/07'-' ina 4% W AUTOMATIC TURRET LATHE? Film! Dara. 14, 1938 FE $heets-Slwet 2 m l Mwub 18, 1941. E. LEISTNER 235 073 AUTOMATIC TURRET LATHE M Filed Dec. 14, 1938 3 Sheets-Sheet I5 ELEM 31 m Mar. 18, 1941 Patents UNITED STATES PATENT OFFICE AUTOMATIC TURRET LATHE Erich- Leistner, Heidenau in Saxony, Germany Application December 14, 1938, Serial No. 245,658 In Germany December 18, 1937 6 Claims.

.utomatic cross travel is possible, the movements eing carried out consecutively or at the same line and irrespectively of the position of the ompound slide rest.

The controls are efiected by cam drums which an be adjusted to the actual operation in a simle manner and at the same time utilized for utomatically controlling both the revolving tool urret several times within a single operation and lso the material feed. The advantage is obvious, s in this construction with stationary head- ;ock practically all imaginable workpieces occur- .ng in the turning and automatic machine shop an be produced on this turret lathe and lengths p to 100 millimetres and more can be dealt with, ccording to the type and size of the machine,

Thus, it is possible to machine parts of rod ma- :rial and to carry out Work in a single fixation, lore particularly the turning down from large iitial diameters in the case of external machinlg, and in the case of internal machining, to prouce from a small initial bore a multiple stepped r backed ofi internal diameter or bore, or to irry out machining of both kinds on one and the one workpiece. It follows that, with this maner of machining, all kinds of differently set .up iaping can be carried out both on the outer side 1d on the inner side of the workpieces.

An embodiment of the invention is illustrated r way oi? example in the accompanying drawgs, in which- Fig. 1 shows a lathe in front elevation,

Fig. 2 shows the cam drum for the longitudinal eve] of the slide rest and the revolving tool rret partly in side elevation and partly in secm, l Fig. 3 shows the revolving tool turret partly in out elevation and partly in section,

Fig. 4 is a top plan view of Fig. 3,

Fig, 5 is an end view of Fig. 3,

Figs. 6, 7, 7a, 8 and 811 show the construction id arrangement of the cam drum illustrated in Fig. 9 is a side elevation of the cam drum and the control arrangement for the slide rest cross xvel, the cam races being each shown as a oarate cam section,

Figs. 10, 10a, 10b, 11, 11a and 11b show indiiual cam sections of the drum illustrated in Fig. in side elevation, top plan view and section.

A bed 2 is supported by uprights I and carries a main saddle 3, on which a cross slide 4 with revolving tool box 5 is mounted.

6 designates a headstock with automatic workpiece gulding mechanism comprising chuck operating levers 1 and feed tube operating levers 9 5 controlled by a cam drum H through the intermediary of a rod system 8 and a rod system In respectively, this drum being mounted on a disengageable driving shaft I2. The shaft I2 also carries a drum l3 with two cam races for controlling the cross slide 4 and the revolving tool turret 5. A third drum M on the shaft l2 serves for the longitudinal displacement of the main saddle.

The cam races of the drum I 3 are formed as 15 separate cam sections 15a. and l5b, which have flanges I6 conforming to the periphery of the drum and provided with fitting bars l6a which serve as fixation feet during the mounting of the cams on the drum.

Each cam section can therefore be removed and quickly replaced by another with the result that any kind of cam races can be built up as required.

The cams on the drum [4 are also composed of separate sections (Figs 6 to 8') Wall plates I7 are mounted on the drum and constructed as feed earns, the plates being longitudinally shiftable on the wall of the drum and secured at distances apart by means of bolts 18 extending through slots in the plates H.

The gaps between the plates ll are filled by guides 20, which are mounted on a second set of wall plates 2| overlapping the wall plates l1 and are also slidable and fixable on the drum by means of bolts 22 extending through slots 23.

To enable the bolts l8 to be exposed and the plates to be shifted, the slots 23 are arranged laterally and the plates 2i provided with out out portions 24. The front end edges are straight.

Thus, the cam feed path can be composed as 40 desired.

The number of control cam plates l1 and of the working cam plates 2| corresponds with the number of cams I51; and 15b.

A link 25 is hingedly connected at one end to 45 the main saddle 3 and at its other end to one end of a lever 26 whose other end is hlngedly connected to the tail upright l.

A spring 21 (Fig. 2) for returning the main saddle 3, at the same time presses the roller 28 5 against the end surfaces of the plates l1 and 2! respectively, owing to the link 25 being coupled to the main saddle.

The cross travel of the revolving tool box takes place with the main saddle through the inter- 55 mediary of the cam sections the against which the roller carrying arm or a two-armed lever, pivotable about a pin is resiliently ores ed, whereas the toothed sector arm or" this lever "hes with W hait mounted eye is of cross o recanted ieeo disc ring tool. turret and rotata'oly con pins engaging moles le movement being obtained or e of elongated shape,

overnent serves for releasing the ing the goositions eiore the turns alone, and our ioveinent a roller is pressed out-= ds by one of a nlurality of cams on the and a spring loaded bolt is nressed out of its locking position.

idle movement or the disc amounts to an angle of about 6 after which a common feed 5 RES olace, for example hrough an angle 35 a ending upon the su-- ion the revel. tool turret.

During the return movement of the sector El o and ring the disc is first turned through an angle of 6 by the dog 58 until the pins a'out against the ends of their holes 5?, with the result that the bolt-notch coupling iii, be comes operative, and the dog 5:3 engages the next following tooth when the disc 55 comes to a standstill.

A second locking device consists of a locking pin 63 secured against rotation and mounted under spring pressure in the housing of the revolving tool turret. This pin has a bevelled end which engages one of the teeth 64 of the feed disc 55.

I claim:

1. An automatic turret lathe, comprising in combination a main saddle, a cross slide on said saddle. a revolving tool turret on said cross slide, a cam arrangement composed of a drum with easily exchangeable cam sections and cooperating with all the aforesaid elements to automatically control their movements, a longitudinal shaft, a roller carrying lever mounted on said tween also and said :1

inlet the corn arovement to shaft and resiliently pressed rengement to i v osci said. a spur ion,

and rotataioly connected projecting nation of said leh iy urled i at to oscillate said.

said ring, a pin id slot o ent with 7 said shaft ry eeo. movement to said revo ing tool box by ring and in on disc to impart each oscillatio the intermediary 3: cool disc,

[all automatic turret lathe, con rising in comhmatlon a main saddle, cross as on said saddle, a revolving tool turret on said cross slide, a cm arrangement composed oi a tilvih with easily exchangeable cam sections cooperatir with all the aforesaid elements to automatically control their movements, longitudinal shaft, a roller carrying lever keyed on said shaft and resiliently pulled aga nst arrange nt oscillate said s toothed sector no; ed. on shaft, a nu on revolving tool box, a toothed ring loosely mounted on said huh and meshing with said sector to rotate during the oscillation of said shaft with said sector, feed disc on said ring, a pin and slot connection between said disc and said hub, and a dog carried by said ring and in operative engagement with said disc to impart at each oscillation of said shaft a rotary feed movement to said revolving tool box through the intermediary of said ring, pawl and feed disc, said pin and slot connection allowing an idle movement equal to an angle of several degrees in both directions between said toothed ring and said hub.

5. An automatic turret lathe, comprising in combination a main saddle, a cross slide on said saddle, a revolving tool turret on said cross slide, a cam arrangement composed of a drum with easily exchangeable cam sections and cooperating with all the aforesaid elements to automatically control their movements, a longitudinal shaft, a roller carrying lever keyed on said shaft oscillation oi ment to oscillate told elicit, a. toothed tectoi ltcved on said shalt, a lino on tile revolvlna' tool not, toothed vino loosely mounted on said hole and mealtime; with said sector to rotate duties the said ollait with said sectoig a iced disc on said vine, a to and slot connectiontd ttveen cold disc and said lento, and a doc carried lav said time and in operative encasement with disc to imnavt at each oscillation of said elicit a rotary iced movement to said nevolvine, tool icon tlii'oooii the intermediary of said ring, cool and ieed disc, said loin and slot connection allo'vvinc an idle movement canal to an angle of several decrees in both directions between said toothed lillilit and said l'lllb, cams on said feed disc, a locltinc bolt on said revolving tool box. a toilet carried lay said laoit and located to enade in said teed disc at a distance in front of one oi said cams canal to the idle movement betvveen told toothed vine and said hub.

din automatic turret lathe, comprising in comliination a main saddle. a cross slide on said caddie, a involving tool turret on said cross slide, a com arrangement composed oi a. drum with easily eitcl'ianeealile cam sections and cooperatlnc vvltn all the aforesaid elements to automati-h callv contl'ol their movements, a. longitudinal shalt, a toilet can-vine levellacy-ed on said it and i'eslllentlv nailed against time cam advancement to oscillate said sliait, a toothed aectot keyed on said shalt, a hula on the l'evolvinc' tool icon, at toothed tine loosely mounted on said t nt and mesliina with said sector to rotate dtnrin the oscillation oi said shaft with said sector, a feed disc on said ring, a pin and slot connection between said disc and said hub, and a dog car-- ried by said ring and in operative eneaaement with said disc to impart at each oscillation oi said shaft a rotary feed movement to said'i'evolvlna tool box through the intermediary oi said tine, pawl and feed disc, said pin and slot connection allowing an idle movement equal to an anele of several degrees in both directions between said toothed ring and said hubncams on said iced disc, a locking bolt on said revolving tool loom a toilet" carried by said bolt and located to engage in said feed disc at said cams equal to the idle movement between said toothed ring and said hub, and a locking device mounted on said ring in engagement with said feed discanci adapted to periodically onerate in synchronism with said bolt.

ERICH LEISTNER.

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